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Stray field induced actuation mode of freestanding magnetic shape memory films
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SYSNO ASEP 0337590 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Stray field induced actuation mode of freestanding magnetic shape memory films Title Aktuační mód indukovaný magnetickým rozptylovým polem ve volně stojící vrstvě Author(s) Thomas, M. (DE)
Heczko, Oleg (FZU-D) RID, ORCID
Buschbeck, J. (DE)
Lai, Y.W. (DE)
McCord, J. (DE)
Kaufmann, S. (DE)
Schultz, L. (DE)
Fähler, S. (DE)Number of authors 8 Source Title Advanced Materials. - : Wiley - ISSN 0935-9648
Roč. 21, č. 36 (2009), s. 3708-3711Number of pages 4 s. Language eng - English Country DE - Germany Keywords stray field ; Ni-Mn-Ga film ; martensite transformation Subject RIV BM - Solid Matter Physics ; Magnetism CEZ AV0Z10100520 - FZU-D (2005-2011) UT WOS 000270441700016 DOI 10.1002/adma.200900469 Annotation Magnetic shape memory alloys are a rare class of materials, which, due to the interaction of ferromagnetism and (micro)-structure, exhibit magnetic field induced strains of the order of 10%. Here we show that in freestanding, epitaxially grown magnetic shape memory Ni-Mn-Ga films a new and enhanced thermal actuation mode can be achieved not feasible in bulk materials. When cooling a ferromagnetic film through the critical temperature of martensitic instability, the avoidance of magnetostatic stray field energy favors orientations of the martensitic unit cell with their easy axis of magnetization aligned in the film plane. As this axis coincides with the short crystallographic axis, this results in a significant shrinkage of the lateral film area. This thermal actuation mode neither requires training nor an external magnetic field. It establishes a path to the realization of sub-micron miniaturized microactuators based on magnetic shape memory films. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2010
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